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[email protected]CVE-2019-16785

HistoryDec 20, 2019 - 11:15 p.m.

CVE-2019-16785

2019-12-2023:15:11

CWE-444

[email protected]

web.nvd.nist.gov

237

waitress

http

request smuggling

http request

nvd

cve-2019-16785

5 Medium

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

PARTIAL

Availability Impact

NONE

AV:N/AC:L/Au:N/C:N/I:P/A:N

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

HIGH

Availability Impact

NONE

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

7.3 High

AI Score

Confidence

High

0.021 Low

EPSS

Percentile

89.1%

JSON

Waitress through version 1.3.1 implemented a “MAY” part of the RFC7230 which states: “Although the line terminator for the start-line and header fields is the sequence CRLF, a recipient MAY recognize a single LF as a line terminator and ignore any preceding CR.” Unfortunately if a front-end server does not parse header fields with an LF the same way as it does those with a CRLF it can lead to the front-end and the back-end server parsing the same HTTP message in two different ways. This can lead to a potential for HTTP request smuggling/splitting whereby Waitress may see two requests while the front-end server only sees a single HTTP message. This issue is fixed in Waitress 1.4.0.

Affected configurations

Vulners

NVD

Node

pylonswaitressRange≤1.3.1

CPENameOperatorVersion
agendaless:waitressagendaless waitressle1.3.1

CPE	Name	Operator	Version
agendaless:waitress	agendaless waitress	le	1.3.1

CNA Affected

[
  {
    "product": "Waitress",
    "vendor": "Pylons",
    "versions": [
      {
        "lessThanOrEqual": "1.3.1",
        "status": "affected",
        "version": "<= 1.3.1",
        "versionType": "custom"
      }
    ]
  }
]